Sub-processor List

Last updated: July 20, 2026 — Version 1.0

Zero Headache engages the following sub-processors to deliver our services and capture, qualify, and book leads. Each sub-processor is contractually bound under a Data Processing Agreement to protect personal data and comply with strict confidentiality obligations.

Sub-processor	Purpose	Data Processed	Region
Twilio	Telephony & SMS transport	Phone numbers, call/message metadata & content	US/EU
Vapi	Voice-agent orchestration	Call audio, metadata	US
Retell AI	Conversational voice API	Call audio, transcripts	US
ElevenAgents	Conversational AI voice generation	Call audio generation	US
OpenRouter	LLM routing & inference	Conversation text	US
Zernio	Knowledge retrieval & agent memory	Business context & transcripts	US
Zapier	Automation & CRM integration	Lead & appointment records	Global
Composio	Lead-source & CRM integration layer	Lead & appointment records	US
Cal.com	Scheduling & calendar	Appointment & contact details	EU
Supabase	Database & application hosting	All Service data	US/EU (Region-pinned)
Trigger.dev	Background jobs & sync orchestration	Lead/appointment records	US
Resend	Transactional email	Email addresses, message content	US
Sent	SMS delivery	Phone numbers, message content	US
Dodo Payments	Payment processing (merchant of record)	Billing & contact details	Global
Paddle	Backup payment processing (merchant of record)	Billing & contact details	Global
PostHog	Website analytics	Usage data	US/EU
AWS Lightsail	Application hosting & deployment	Service data	US/EU
Langfuse	LLM observability & tracing	Conversation logs	US

*Note: This list is kept updated as our technology stack evolves. Clients will be notified of any changes to our subprocessors list in accordance with the DPA.

What Our Customers Say?

They've Stopped Missing Calls. So Can You.

See how local service operators use our AI agent to answer the leads while you're busy on the job, qualify leads instantly & keep their calendars full.

Full schedule without lifting the phone.

"My front desk person quit on a Thursday. On the Friday we set this up, and by Monday morning it was booking appointments on its own. I do not really understand how it works, and I do not need to. My calendar has been full since that first week."

Massimo Ferretti

Owner, Weight-loss & Wellness Clinic
Milan, Italy

It actually gets the details right.

"We were losing jobs because no one could answer fast enough. We tried two answering services. One was too expensive, the other kept getting the job details wrong and we would have to call the customer back. This one gets the details right the first time, and most callers do not realize it is not a person."

Aoife Brennan

Office Manager, Plumbing & HVAC Company
Dublin, Ireland

The lead is in my CRM before they hang up.

"I almost did not try it. I have been burned by this kind of thing before. We were live in about three days, and it connected to our CRM without me doing anything. My crews get the lead on their phones before the customer has even hung up. That part alone was worth it for us."

Sipho Mahlangu

Founder, Roofing Services Business
Johannesburg, South Africa

Every call gets answered now.

"I run a crew of twelve and I am on sites all day. I cannot answer the phone. It used to go to voicemail, and I would hope people called back. Most did not. Now every call gets answered and I get a text with the details. That is the whole thing for me."

Lukas Hoffmann

Owner, Landscaping Company
Munich, Germany

My advisors can focus on the cars now.

"People call us all day for oil changes, tyres, estimates. We used to miss maybe thirty percent of calls during the busy hours. Now every one of them gets answered, and most get booked on the call. My service advisors can actually focus on the cars in front of them instead of the phone."

Hamish Caldwell

General Manager, Chain of Auto Repair Shops
Manchester, UK

Like a receptionist I can finally afford.

"I started this business from my flat and I still cannot afford a full-time receptionist. This answers my calls, sends out the quotes, and books the walkthrough, all while I am out actually cleaning houses. It is the best money I spend every month."

Lucía Vargas

Owner, Cleaning Services Company
Madrid, Spain

Patients do not realise it is not a person.

"What sold me is that it does not sound like one of those awful phone menus. Patients talk to it normally and it books them in. We had an older patient call last month and she asked the receptionist in our office when our new receptionist had started. She had been talking to the agent the whole time."

Sander de Vries

Operations Head, Chain of Dental Practices
Amsterdam, Netherlands

We cut response time without hiring.

"We manage about two hundred units across four properties. The maintenance requests alone were drowning our office staff. Now a tenant calls, the agent logs everything, creates the ticket, and we dispatch. We cut our response time in half, and we did not hire anyone new."

Henrik Lindqvist

Director, Property Management Company
Stockholm, Sweden

Support answered me at 11 at night.

"We had a strange issue with how it was syncing to our calendar at about 11 at night. I sent a message not expecting a reply till morning. They got back to me in maybe twenty minutes and had it sorted before I went to bed. I have not had support like that from a vendor in years."

Callum Gallagher

Owner, Electrical Services Business
Brisbane, Australia

The first one I trust with our patients.

"I have looked at a lot of these AI phone tools for our locations. Most of them fall apart the second a caller goes off script. This is the first one where I actually trust it with our patients. Bookings are up, no-shows are down, and my front desk team is not burned out anymore."

Camille Laurent

VP Operations, Group of Med Spas
Paris, France